This is bizarre. If you are a developer, what right does Apple have to seeing your finances for all purchases made in the app that they sold on their store?.
This sounds like a lose-lose for developers. Either you submit to Apple's ~~walled garden~~ padded cell of an ecosystem and give them money, or you have to find a different payment system and give Apple a cut anyway, which might end up costing you even more in the long run.
This seems even more anti-competitive than before!